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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#include "arrow/dataset/file_orc.h"
#include <memory>
#include "arrow/adapters/orc/adapter.h"
#include "arrow/dataset/dataset_internal.h"
#include "arrow/dataset/file_base.h"
#include "arrow/dataset/scanner.h"
#include "arrow/util/checked_cast.h"
#include "arrow/util/future.h"
#include "arrow/util/iterator.h"
#include "arrow/util/logging.h"
#include "arrow/util/thread_pool.h"
namespace arrow {
using internal::checked_pointer_cast;
namespace dataset {
namespace {
Result<std::unique_ptr<arrow::adapters::orc::ORCFileReader>> OpenORCReader(
const FileSource& source,
const std::shared_ptr<ScanOptions>& scan_options = nullptr) {
ARROW_ASSIGN_OR_RAISE(auto input, source.Open());
arrow::MemoryPool* pool;
if (scan_options) {
pool = scan_options->pool;
} else {
pool = default_memory_pool();
}
auto reader = arrow::adapters::orc::ORCFileReader::Open(std::move(input), pool);
auto status = reader.status();
if (!status.ok()) {
return status.WithMessage("Could not open ORC input source '", source.path(),
"': ", status.message());
}
return reader;
}
/// \brief A ScanTask backed by an ORC file.
class OrcScanTask {
public:
OrcScanTask(std::shared_ptr<FileFragment> fragment,
std::shared_ptr<ScanOptions> options)
: fragment_(std::move(fragment)), options_(std::move(options)) {}
Result<RecordBatchIterator> Execute() {
struct Impl {
static Result<RecordBatchIterator> Make(const FileSource& source,
const FileFormat& format,
const ScanOptions& scan_options) {
ARROW_ASSIGN_OR_RAISE(
auto reader,
OpenORCReader(source, std::make_shared<ScanOptions>(scan_options)));
auto materialized_fields = scan_options.MaterializedFields();
// filter out virtual columns
std::vector<std::string> included_fields;
ARROW_ASSIGN_OR_RAISE(auto schema, reader->ReadSchema());
for (const auto& ref : materialized_fields) {
ARROW_ASSIGN_OR_RAISE(auto match, ref.FindOneOrNone(*schema));
if (match.indices().empty()) continue;
included_fields.push_back(schema->field(match.indices()[0])->name());
}
std::shared_ptr<RecordBatchReader> record_batch_reader;
ARROW_ASSIGN_OR_RAISE(
record_batch_reader,
reader->GetRecordBatchReader(scan_options.batch_size, included_fields));
return RecordBatchIterator(Impl{std::move(record_batch_reader)});
}
Result<std::shared_ptr<RecordBatch>> Next() {
std::shared_ptr<RecordBatch> batch;
RETURN_NOT_OK(record_batch_reader_->ReadNext(&batch));
return batch;
}
std::shared_ptr<RecordBatchReader> record_batch_reader_;
};
return Impl::Make(fragment_->source(),
*checked_pointer_cast<FileFragment>(fragment_)->format(),
*options_);
}
private:
std::shared_ptr<FileFragment> fragment_;
std::shared_ptr<ScanOptions> options_;
};
class OrcScanTaskIterator {
public:
static Result<Iterator<std::shared_ptr<OrcScanTask>>> Make(
std::shared_ptr<ScanOptions> options, std::shared_ptr<FileFragment> fragment) {
return Iterator<std::shared_ptr<OrcScanTask>>(
OrcScanTaskIterator(std::move(options), std::move(fragment)));
}
Result<std::shared_ptr<OrcScanTask>> Next() {
if (once_) {
// Iteration is done.
return nullptr;
}
once_ = true;
return std::make_shared<OrcScanTask>(fragment_, options_);
}
private:
OrcScanTaskIterator(std::shared_ptr<ScanOptions> options,
std::shared_ptr<FileFragment> fragment)
: options_(std::move(options)), fragment_(std::move(fragment)) {}
bool once_ = false;
std::shared_ptr<ScanOptions> options_;
std::shared_ptr<FileFragment> fragment_;
};
} // namespace
OrcFileFormat::OrcFileFormat() : FileFormat(/*default_fragment_scan_options=*/nullptr) {}
Result<bool> OrcFileFormat::IsSupported(const FileSource& source) const {
RETURN_NOT_OK(source.Open().status());
return OpenORCReader(source).ok();
}
Result<std::shared_ptr<Schema>> OrcFileFormat::Inspect(const FileSource& source) const {
ARROW_ASSIGN_OR_RAISE(auto reader, OpenORCReader(source));
return reader->ReadSchema();
}
Result<RecordBatchGenerator> OrcFileFormat::ScanBatchesAsync(
const std::shared_ptr<ScanOptions>& options,
const std::shared_ptr<FileFragment>& file) const {
// TODO investigate "true" async version
// (https://issues.apache.org/jira/browse/ARROW-13795)
ARROW_ASSIGN_OR_RAISE(auto task_iter, OrcScanTaskIterator::Make(options, file));
struct IterState {
Iterator<std::shared_ptr<OrcScanTask>> iter;
RecordBatchIterator curr_iter;
bool first;
::arrow::internal::Executor* io_executor;
};
struct {
Future<std::shared_ptr<RecordBatch>> operator()() {
auto state = state_;
return ::arrow::DeferNotOk(
state->io_executor->Submit([state]() -> Result<std::shared_ptr<RecordBatch>> {
if (state->first) {
ARROW_ASSIGN_OR_RAISE(auto task, state->iter.Next());
ARROW_ASSIGN_OR_RAISE(state->curr_iter, task->Execute());
state->first = false;
}
while (!IsIterationEnd(state->curr_iter)) {
ARROW_ASSIGN_OR_RAISE(auto next_batch, state->curr_iter.Next());
if (IsIterationEnd(next_batch)) {
ARROW_ASSIGN_OR_RAISE(auto task, state->iter.Next());
if (IsIterationEnd(task)) {
state->curr_iter = IterationEnd<RecordBatchIterator>();
} else {
ARROW_ASSIGN_OR_RAISE(state->curr_iter, task->Execute());
}
} else {
return next_batch;
}
}
return IterationEnd<std::shared_ptr<RecordBatch>>();
}));
}
std::shared_ptr<IterState> state_;
} iter_to_gen{std::shared_ptr<IterState>(
new IterState{std::move(task_iter), {}, true, options->io_context.executor()})};
return iter_to_gen;
}
Future<std::optional<int64_t>> OrcFileFormat::CountRows(
const std::shared_ptr<FileFragment>& file, compute::Expression predicate,
const std::shared_ptr<ScanOptions>& options) {
if (ExpressionHasFieldRefs(predicate)) {
return Future<std::optional<int64_t>>::MakeFinished(std::nullopt);
}
auto self = checked_pointer_cast<OrcFileFormat>(shared_from_this());
return DeferNotOk(options->io_context.executor()->Submit(
[self, file]() -> Result<std::optional<int64_t>> {
ARROW_ASSIGN_OR_RAISE(auto reader, OpenORCReader(file->source()));
return reader->NumberOfRows();
}));
}
// //
// // OrcFileWriter, OrcFileWriteOptions
// //
std::shared_ptr<FileWriteOptions> OrcFileFormat::DefaultWriteOptions() {
// TODO (https://issues.apache.org/jira/browse/ARROW-13796)
return nullptr;
}
Result<std::shared_ptr<FileWriter>> OrcFileFormat::MakeWriter(
std::shared_ptr<io::OutputStream> destination, std::shared_ptr<Schema> schema,
std::shared_ptr<FileWriteOptions> options,
fs::FileLocator destination_locator) const {
// TODO (https://issues.apache.org/jira/browse/ARROW-13796)
return Status::NotImplemented("ORC writer not yet implemented.");
}
} // namespace dataset
} // namespace arrow